Exhaust muffler



April 13, 1937. R. w. ROSS EXHAUST MUFFLER Filed April 21, 1956 2Sheets-Sheet l INVENTOR RUTH WARREN 9055 ATTORNEY April 13, 1937.

R. W. ROSS EXHAUST MUFFLER Filed April 21, 1956 2 Sheets-Sheet 2INVENTOR RUTH WARREN R055 W ATTORNEY Patented Apr. 13, 1937 UNITEDSTATES PATENT OFFICE Ap lication April 21,

4 Claims.

This invention relates to improvements in mufflers for the exhaust gasesof internal combustion engines and deals more particularly to that typeof device which employs exhaust gas impelled means for reducing backpressure within the muffler.

The invention contemplates the provision of an improved form of mufflerin which a plurality of fans, each associated with a gas deflector, are

positioned within a casing or housing in a manner to provide a series ofchambers of progressively increasing volume whereby the exhaust gasesare in continuous expansion upon entrance into said casing.

The invention also contemplates the provision of an increasingly taperedmufiler casing for enhancing the expansibility of the exhaust gasestherein.

Another feature of the invention resides in the provision of gasimpelled wheels or fans, each member being adapted for rotation in adirection opposite to an adjacent wheel or fan.

With the above objects, advantages and features in mind, and othershereinafter disclosed, the invention resides in the novel combinationand arrangement of the parts as hereinafter described, said descriptionbeing based on the accompanying drawings for part of this disclosure.

In the drawings, which are illustrative only:

Fig. 1 is a longitudinal sectional view of a preferred form of muffler.

Fig. 2 is an enlarged transverse sectional view as taken on the line 22of Figure 1.

Figs. 3 and 4 are respectively similar views of an alternate preferredform of the invention.

Referring to the drawings in greater detail, the mufiler generallycomprises a shell or casing Ill, an intake head II and an exhaust headI2 at opposite ends of the shell. In the present instance, it ispreferred to taper the shell ID from a relatively small diameter at theintake head to a relatively greater diameter at the exhaust head.

Divers means may be employed for retaining the muffler heads inassembly. However, a preferred means for accomplishing this, is toprovide a plurality of longitudinal stay wires I3 for holding said headsin non-displaceable position.

The heads II and I2 are preferably conically formed as shown so thegases entering the muffler may not become lodged in blind pockets.

Since the invention contemplates the transition of exhaust gases throughthe mufiler in as smooth a manner as possible, the entire design of thecasing and heads are along streamline lines as shown.

1936, Serial No. 75,536

The gas impelled devices, in the form of fans l4, I5 and I6 arepreferably placed athwart the muffler, the fan I4, nearest the intakehead being smallest, and the fan I6, nearest the exhaust head beinglargest. Also, the fans I4 and 15 are placed relatively near each otherto provide a relatively small expansion chamber ll, while the fans I5and I6 are somewhat further apart to form a relatively larger expansionchamber I8 and finally the fan I6 is positioned in relation to theexhaust head l2 to form the largest expansion chamber [9, the threeexpansion chambers, in this manner, being successively located inprogressively larger portions of the shell Ill.

Each fan is mounted by means of a pivot pin 20, in bearing blocks 2 I,each fixedly held in a bracket or stanchion 22. A preferred means, forholding the bearing blocks in adjusted position, comprises slitting a.portion of each stanchion as at 23 and providing a clamp screw 24 forurging d the free portion of the clamp thus formed towards the rigidportion.

To facilitate mounting the stanchions within the shell I 0, they arefirst preferably mounted on rails 25 which may then be secured as bywelding to said shell.

The fans l4, I5 and I6 are each associated with a deflector,respectively designated 26, 2'! and 28 and arranged in front of eachrespective fan for the purpose of deflecting the oncoming gases to themore efficient portions of the fans.

While all the several fans may be arranged to be rotated in the samedirection, it is preferred to have the center fan I5 rotate in adirection opposite to that of the other two fans to afford greaterturbulence to the gases in their passage through the muffler casing.

From the foregoing it may be seen that the exhaust gases, in passingthrough the muffler,

are first deflected by the deflector 26 towards the walls of the shelland their substantially straight through motion is translated into aswirling motion by reaction from the blades of the fan M. The swirlinggases in the chamber I! are then deflected by the deflector 21 beforeacting on and being motivated by the fan I 5, but in this instance thegas particles are further agitated by the reverse rotation of saidlatter fan. The gases in the chamber I8, now in a great state ofturbulence, may expand in this larger chamber before passing by thedeflector 28 and fan I6 for further swirling etc. The gases finallydischarge into the chamber I9 where further expansion is afforded beforepassing into atmosphere through the exhaust head I2.

In this manner, not only is the noise of explosion effectively muffled,but back pressure of the exhaust gases is entirely eliminated, henceimproving the efficiency and reducing the fuel consumption of aninternal combustion engine.

While it is preferred to taper the mufiler shell as shown, good resultsmay be attained by employing a cylindrical shell with the progressivelyincreasing expansion chambers as described.

Another manner of accomplishing the desired results is shown in Figures3 and 4, wherein the middle fan 15 is positioned to one side of thecenter line of the mufiler, and the other fans I l and l8 are positionedto the other side of the center line, with the respective deflectors 262! and 28 each located on the center of rotation of the fans, and as soarranged they will impose a circuitous route upon the products ofcombustion passing through the casing and thus attain the usual mufiiingaction upon said products.

More or less fans and deflectors may be employed and other changes inthe arrangement of the parts may be made within the meaning of thisdisclosure.

What I claim as new and desire to secure by Letters Patent, is:

1. A muffler comprising a casing having intake and exhaust heads, and atleast two fans rotatably mounted in said casing and so spaced from theheads and from each other that increasingly larger chambers are formedbetween the intake head and the first fan, between the first fan and thesecond fan, and between the second fan and the exhaust head, and one ofsaid fans being out of axial alignment with respect to one of the otherfans.

2. A muiiler comprising a casing having intake and exhaust heads, saidcasing being increasingly tapered towards said exhaust head and two ormore fans rotatably mounted in said casing in non-axial alignment.

3. A mufiier comprising a casing, said casing being increasingly taperedfrom its intake end towards its exhaust end, one or more fans rotatablymounted in said casing, and one or more deflectors axially arranged infront of said fan or fans, at least one of said fans and deflectorsbeing non-axial with said other fan or fans.

4. A muiller comprising a casing, said casing being increasingly taperedfrom its intake end towards its exhaust end, one or more fans rotatablymounted in said casing, and one or more deflectors axially arranged infront of said fan or fans, the centers of said fans spaced from thecenter line of said casing.

RUTH WARREN ROSS.

